Plot using colors

Dear R users,
I have a problem since I try to plot my datas with different colors.

plot(tvar, var, xlab="zeit [s]",ylab="Variation [%]",  col = ifelse(var <=
varstability, 'green','red'))
this works well!

But since I add a type="l" to my plot, it will color all the plot with
green!!!
Is there any solution? I avoid to use teachingDemos.

Thanks.

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